public class Test8 {
    public static void main(String[] args) {
        int[] arr={1,2,3,4,5,6,7,8,9};
        String str=arrToString(arr);
        System.out.println(str);


    }
    public static String arrToString(int[] arr)
    {
        StringBuilder sb=new StringBuilder();
        sb.append("[");
        for (int i = 0; i <arr.length; i++) {
            if(i==arr.length-1){
                sb.append(arr[i]);
            }
            else{
                sb.append(arr[i]+",");
            }
        }
        sb.append("]");
        return sb.toString();
    }
}
